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FIBOCOM SU806 Series Hardware Guide
Page 57 of 79
Pin Name
Pin Number
I/O
Description
Note
ANT_GNSS
121
AI
GNSS antenna
-
4.3.1
Operating Frequency
Table 4-8 GNSS operating frequency
Mode
GPS
1575.42±1.023
MHz
BeiDou
1561.098±2.046
MHz
4.3.2
GNSS Antenna Reference Design
4.3.2.1
Passive Antenna Reference Design:
SU806 series module have a built-in LNA. The passive antenna is used in the design of the device.
Microstrip trace is recommended for the GNSS RF route, with insertion loss within 0.2dB and impedance
at 50Ω.
The GNSS antenna reference design is shown in the following figure:
Module
ANT_GNSS
GNSS_Antenna
NC
0R
82nH
Figure 4-3 GNSS passive antenna reference design
Note
:
For GNSS passive antenna, it is recommended to add an 82nH indictor near antenna connector
to improve GNSS antenna’s ability of resist ESD. For better ability of resist ESD, please choose
TVS that junction capacitance less than 0.5pF, recommended type: ESD9D5U, with 0.5pF
junction capacitance and 5.0V embedded voltage.